SILUBID.*:. 173 



A. 17-18. Head 4f in total. Eye in 



length of head. Maxillary barbels nearly 



as long as head. Teeth on palate in two 



convex, oblong ovate patches, rather 



convergent behind. Dorsal spine as long 



as head excluding snout 22. A.jella, p. 187 



A. 14-16. Head 4 to 4 1 in total. Eye 6| 



in length of head. Maxillary barbels 



rather longer than head. Teeth on 



palate in two patches on each side. 



Dorsal spine as long as head excluding 



snout 23. A. dussumieri, p. 188. 



179. (1.) Arms burmanicus. 



Arms burmanicus, Day, P. Z. S. 1869, p. 618, and Fish. India, 

 p. 458, pi. cv, fig. 4. 



Nga-kyouny, Burmese. 

 B. vi. D. 1/7 | 0. P. 1/10. Y. 6. A. 19-22 (4-6/15-16). C. 15. 



Length of head 3| to 3f , of caudal fin 5, height of body 7 in the 

 total length. Eyes without free orbital edges, diameter 7 to 8| 

 in the length of head, 2| to 3 diameters from the end of snout, 

 and 1 \ to 2 apart. Head depressed, snout spatulate, upper jaw 

 the longer; the greatest width of head equals two fifths of its 

 length, while its height is less. The median longitudinal groove 

 on the head narrow and not extending so far as to the base of the 

 occipital process, which is keeled and rather wider at its base than 

 it is long, while superiorly it reaches a Y-shaped basal bone. 

 Upper surface of the head with roughened lines, which are closest 

 together at the posterior end of the median groove and on the 

 occipital process. Barbels short, the maxillary do not quite 

 reach the base of the pectoral fin, the outer maudibular are nearly 

 as long. Teeth those on the palate villiform in two small, oval, 

 obliquely set patches (not so large as the eye) diverging poste- 

 riorly. Fins the dorsal half as high again as the body, its spine 

 strong, half as long as the head, and serrated anteriorly and pos- 

 teriorly ; base of adipose dorsal about as long as that of the rayed 

 fin. Pectoral spine of the same length as the dorsal, stronger, 

 serrated on both edges. Yentral nearly reaching the anal. Colour 

 purplish, dashed with copper, becoming dull white on the sides 

 and beneatb. Both dorsal fins externally stained with black. 



Hab. Tidal rivers of Burma ; attaining at least a foot in length. 



180. (2.) Arius nenga. (Fig. 67.) 



Pimelodus nenga, Ham. Buch. Fish. Ganges, pp. 171, 376. 



Arius nenga, Day, Fish. India, p. 458, pi. civ, fig. 3 (see synon.). 



Shiiiydlpetdda, Marathi. 



B. vi. D. 1/7 | 0. P. 1/10. V. 6. A. 19 (6/13). C. 17. 

 Length of head 4|, of caudal fin 5, height of body 5 in the total 



